Top portion of an electronic computer



FIG. 1 is a top, front and right side perspective view of a top portion of an electronic computer showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof.

The broken line showing of the remaining portions of the electronic computer are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a top portion of an electronic computer, as shown and described. 